CN107782608A - A kind of material hole extrusion experiment method - Google Patents
A kind of material hole extrusion experiment method Download PDFInfo
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- CN107782608A CN107782608A CN201710803715.4A CN201710803715A CN107782608A CN 107782608 A CN107782608 A CN 107782608A CN 201710803715 A CN201710803715 A CN 201710803715A CN 107782608 A CN107782608 A CN 107782608A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The present invention relates to a kind of material hole extrusion experiment method.This material hole extrusion experiment method, which is related to, carries out compressional deformation processing to material bore area to improve the research of endoporus skin stress distribution.In order to solve the existing indirect sex chromosome mosaicism that plastic zone is analyzed using finite element method, the present invention devises a kind of material experiment method, has obtained directly perceived and image plastic zone scope and shape information.This method is exactly to imitate one piece of overall sample with two pieces of semicircle samples are stitched together, two pieces of semicircle samples are made tightly to be against together with sufficiently large power during experiment, then a manhole is processed in two pieces of supporting at joint close gap for semicircle sample, hole compressional deformation processing is carried out to manhole inwall using a crowded hole pin and causes to extrude trace, remove and push against power separately sample, the plastic zone upspring just is able to observe that on former abutting face.
Description
Technical field
The present invention relates to a kind of material hole extrusion experiment method.This material hole extrusion experiment method is related to material endoporus
Surface carries out compressional deformation processing to improve the research of endoporus skin stress distribution.
Technical background
The technology that deformation process is carried out to material bore area is widely used already, and good effect is achieved in practice
Fruit, such as：To the extrusion process of aircraft structure endoporus, the fatigue strength of aircraft structure is considerably improved.
Pressing method its principle in hole is by making material bore area that partial mold deformation sequentially occur, finally making material
Surface generates the compressive pre-stress layer of expected design, so as to substantially increase the static strength of part and fatigue strength.
After US3661655A describes a kind of progress dynamic load to flexible member, peening immediately is frozen spring
At least one surface, so that its surface produces residual compressive stress.
With the development of production, the performance more and more higher of material is on the one hand required, on the other hand requires the cost of material again
More and more lower, the research and development for relying solely on new material are obviously difficult to meet the needs of this conflicting, and surface is carried out at deformation
The technology of reason can significantly improve material property, it is thus possible to preferably solve this on the premise of less increase material cost
One contradiction.
The methods of hole extrusion process, bead, rolling processing and hammer peening, is each advantageous, and respectively has limitation, is
Deepen understanding, the research to the microcosmic mechanism of surface deformation of material, it is clear that it is extremely urgent, wherein when just including hole extrusion process
The research in inner micro plastic deformation area (hereinafter referred to as plastic zone).
It is to be drilled first on overall sample and carry out hole extrusion process that one kind, which is contemplated, and then the immediate vicinity in hole is vertical
Downwards cut sample, then, to cut face plastic zone carry out observational study, but due to cutting sample vertically downward during
The sustained release of stress so that the plastic zone vestige instantaneously upspring is cut open processing and erased completely, and modeling can not be observed after incision
The vestige in property area.
The common method of the research use to plastic zone is at present：The extruding of material hole is established using FEM-software ANSYS
Strengthen the three-dimensional finite element model of residual stress field, respectively structure under sunykatuib analysis different pore size, the magnitude of interference, thickness and hole back gauge ratio
The three-dimension parameter design field distribution of part cold holes expansion.
This method advantage is that the stress state of data extraction procedure plastic zone is interference-free.
Shortcoming is that acquired strain data is surface data, and the change of plastic zone occurs in the inside of material, plasticity
The situation in area can only be obtained indirectly by the method for finite element analysis, and this method needs to set a series of boundary condition, these
The basis of design of boundary condition is often and insufficient, causes finally to analyze obtained plastic zone and not fully meets truth,
It is limited to the directive significance of actual research and production.
Gao Yukui etc. exists《The three-dimensional simulation analysis of 300M unimach cold holes expansions residual stress field》In one text, profit
The cold holes expansion residual stress of 300M superhigh intensity steel members is calculated with the simulation of ANSYS finite element softwares, establishes material
The hole squeeze residual stress field three-dimensional finite element model of different-thickness component, component thickness of having analyzed and researched is to residual stress field
Influence, it is determined that the position that maximum residual stress occurs, compare hole extruding entrance, middle part and exit residual stress field
Situation of change.
Liu Xiaolong etc. exists《The three dimensional FEM simulation and experimental study of cold holes expansion residual stress field》In one text, use
FEM-software ANSYS establishes the three-dimensional finite element model of cold holes expansion residual stress field, and simulation calculates different-thickness
The three-dimension parameter design field distribution of 7050-T7451 aluminium alloy element cold holes expansions.
The content of the invention
In order to solve the existing indirect sex chromosome mosaicism that plastic zone is analyzed using finite element method, inventor devises one
Kind material hole extrusion experiment method, and substantial amounts of experiment has been carried out, obtain directly perceived and image plastic zone scope and form letter
Breath.
This method is exactly to imitate one piece of overall sample with two pieces of semicircle samples are stitched together, makes two and half during experiment
Circular specimen is tightly against together with sufficiently large power, and this pushes against two pieces of semicircle samples during confirmation of trying hard to keep is tested and supports joint close
Gap is not in instantaneous opening or the situation of the changing of the relative positions, then, a circle is processed in two pieces of supporting at joint close gap for semicircle sample
Shape through hole, then, hole compressional deformation processing is carried out to manhole inwall using a crowded hole pin and causes to extrude trace, is most dropped back
Fall to push against power and separate sample, at this moment, the plastic zone upspring just is able to observe that on former abutting face.
Specific practice is as follows：
Sample to be tested material is processed into two pieces first, has a face to carry out planar accurate grinding processing on each piece, to reach
Flatness and finish as high as possible.
Secondly, two dowel holes, a screwed hole and a shoulder hole are processed respectively on every piece of sample, it is ensured that two
The two bright and clean coplanar flats and relative engagement of block sample.
Two pieces of samples are connected to become two pieces of sample combinations with two alignment pins, two screws.
Two pieces of sample combinations are added external cylindrical surface, interior cylindrical hole and two end faces through being once loaded on lathe, and
Ensure cylindrical center's line on two pieces of sample faying faces.
Machine two pieces of sample combinations are placed in open wedge set, utilize phase interworking on tightening sleeve, clamping sleeve
The screw thread of conjunction, screws clamping sleeve, so that between wedge-shaped sleeve wedging tightening sleeve and two pieces of sample combinations, combines system robust
For an entirety.
Imported from the centre bore of clamping sleeve and squeeze hole pin, and continue to depress crowded hole pin, the crowded hole fin squeezed on the pin of hole is from two pieces
The centre bore of sample combination is squeezed through, and plastic extruding deformation is brought to two pieces of sample combination centre bores.
Two pieces of sample combinations are opened, the plastic extruding deformation area on every piece of sample upsprings because external force cancels, area of upspringing
Comprising information provide material hole compressional deformation plastic zone research new way.
Brief description of the drawings
Accompanying drawing 1 is a kind of implementation process schematic diagram of material hole extrusion experiment method：1 is the pressure put on crowded hole pin
Power；2 sell to squeeze hole；3 be clamping sleeve；4 be tightening sleeve；5 be open wedge set；6 be right sample block；7 be left sample block；8 be right sample block
With the interior cylindrical hole among left sample block；9 be the support force of supports right sample block and left sample agllutination zoarium；12 be right sample block and left sample block
Combination supports joint close；14 be the crowded hole fin on crowded hole pin；D is the diameter of the interior cylindrical hole among right sample block and left sample block；D
To squeeze the diameter of the crowded hole fin on the pin of hole.
Accompanying drawing 2 is right sample block and left sample agllutination zoarium schematic diagram：10 be on right sample block and left sample agllutination zoarium be in diagonal
Two screws of arrangement；11 be in two alignment pins of diagonal arrangement on right sample block and left sample agllutination zoarium.
Accompanying drawing 3 is to open two pieces of sample combinations, and the plastic extruding deformation area on every piece of sample upsprings because external force cancels
Schematic diagram：13 plastic zone to be upspring after two pieces of sample combinations of opening in ellipse circle.
Embodiment
Right sample block 6 and the installation of left sample block 7 are combined into two pieces of sample combinations with two screws 10 and two alignment pins 11.
Two pieces of sample combinations are placed in open wedge set 5, using the screw thread to be cooperated on tightening sleeve 4 and clamping sleeve 3,
Clamping sleeve 3 is screwed, so that between the wedging tightening sleeve 4 of open wedge set 5 and two pieces of sample combinations, is combined into system robust
One entirety.
In the effect of the support force 9 of supports right sample block 6 and the combination of left sample block 7 and the pressure 1 put on crowded hole pin 2
Under, the interior cylindrical hole 8 that hole pin 2 is penetrated among right sample block 6 and left sample block 7 is squeezed, due to squeezing the diameter D of crowded hole fin 14 on hole pin 2
More than the diameter d of the interior cylindrical hole 8 among right sample block 6 and left sample block 7, the crowded hole fin 14 squeezed on hole pin 2 passes through the right He of sample block 6
During interior cylindrical hole 8 among left sample block 7, cause the certain model of the inwall of interior cylindrical hole 8 among right sample block 6 and left sample block 7
Sequentially it is plastically deformed in enclosing, because generation is plastic extruding deformation, right sample block 6 and the left combination of sample block 7 support
Joint close 12 will not be opened in experimentation and the changing of the relative positions.
Then, right sample block 6 and the left combination of sample block 7 are opened, the plastic extruding deformation area on every piece of sample cancels because of external force
And upspring, the plastic zone 13 upspring.
The plastic zone vestige 13 upspring is measured using means such as laser co-focusing microscopic analyses, analyzed, it becomes possible to
The information such as plastic zone scope, area and bounce amount are obtained, hole compressional deformation can be analyzed to material internal according to these information
The influence of change of stress field.
Claims (3)
1. a kind of material hole extrusion experiment method it is characterized in that：One piece of overall examination is imitated with two pieces of semicircle samples are stitched together
Sample, two pieces of semicircle samples is tightly against together with sufficiently large power during experiment, then, closed in two pieces of supporting for semicircle sample
A manhole is processed at gap, then, hole compressional deformation processing is carried out to manhole inwall using a crowded hole pin
And cause to extrude trace, finally remove and push against power separately sample, at this moment, the plasticity upspring just is able to observe that on former abutting face
Area, in the support force (9) of supports right sample block (6) and the combination of left sample block (7) and the pressure (1) put on crowded hole pin (2)
In the presence of, the interior cylindrical hole (8) that hole pin (2) is penetrated among right sample block (6) and left sample block (7) is squeezed, due to squeezing on hole pin (2)
The diameter (d) for the interior cylindrical hole (8) that hole fin (14) diameter (D) is more than among right sample block (6) and left sample block (7) is squeezed, squeezes hole pin
(2) the crowded hole fin (14) on is by during the interior cylindrical hole (8) of right sample block (6) and left sample block (7) centre, causing right sample
Sequentially it is plastically deformed in interior cylindrical hole (8) inwall certain limit among block (6) and left sample block (7), then, is opened
Right sample block (6) and left sample block (7) combination, the plastic extruding deformation area on every piece of sample upsprings because external force cancels, and obtains bullet
The plastic zone (13) risen.
2. a kind of material hole extrusion experiment method as described in claim 1 it is characterized in that：Utilize laser co-focusing microscopic analysis
The plastic zone vestige (13) upspring is measured etc. means, analyzed, plastic zone scope, area and bounce amount etc. can be obtained
Information, influence of the hole compressional deformation to material internal change of stress field can be analyzed according to these information.
3. a kind of material hole extrusion experiment method as described in claim 1 it is characterized in that：It is fixed with two screws (10) and two
Right sample block (6) and left sample block (7) installation are combined into two pieces of sample combinations by position pin (11), and two pieces of sample combinations are placed in opening
In wedge-shaped sleeve (5), using the screw thread to be cooperated on tightening sleeve (4) and clamping sleeve (3), clamping sleeve (3) is screwed, so that opening
Between wedge-shaped sleeve (5) wedging tightening sleeve (4) and two pieces of sample combinations, system robust is integrated into a whole, ensure that the right side
Sample block (6) and left sample block (7) combination support joint close (12) and will not opened in experimentation and the changing of the relative positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710803715.4A CN107782608B (en) | 2017-09-08 | 2017-09-08 | Material hole extrusion experiment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710803715.4A CN107782608B (en) | 2017-09-08 | 2017-09-08 | Material hole extrusion experiment method |
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| CN107782608A true CN107782608A (en) | 2018-03-09 |
| CN107782608B CN107782608B (en) | 2020-12-29 |
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| CN201710803715.4A Expired - Fee Related CN107782608B (en) | 2017-09-08 | 2017-09-08 | Material hole extrusion experiment method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109033554A (en) * | 2018-07-04 | 2018-12-18 | 北京航空航天大学 | A kind of turbine disk cold holes expansion technique Numerical Simulation analogy method |
| CN110031315A (en) * | 2019-05-29 | 2019-07-19 | 吉林大学 | A kind of material hole extrusion experiment method |
| CN112577984A (en) * | 2020-11-09 | 2021-03-30 | 中国科学院金属研究所 | Preparation method of block sample for observing deformation behavior of zirconium alloy |
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| CN109033554A (en) * | 2018-07-04 | 2018-12-18 | 北京航空航天大学 | A kind of turbine disk cold holes expansion technique Numerical Simulation analogy method |
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| CN112577984A (en) * | 2020-11-09 | 2021-03-30 | 中国科学院金属研究所 | Preparation method of block sample for observing deformation behavior of zirconium alloy |
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| Publication number | Publication date |
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| CN107782608B (en) | 2020-12-29 |
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